Method of strapping wood in bending



n TEE sTATEs yPATENT oEErcE.

JOHN L. FIELD, OF SYRACUSE, NEW` YORK.

METHOD 0F STRAPPING WOOD IN BENDING.

Specification of Letters Patent No. 23,912, dated May 10, 1859.

To all whom it may concern:

Be it known that I, JOHN L. FIELD, of the cityof Syracuse, in the county of Onondaga and State of New York, have invented a new and useful Improvement in Devices for Bending Timber; and I do hereby declare the following' to be a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making part of this specification, in which- Figure l, represents a perspective view vof a forming frame. Fig. 2, represents a metallic strap used for obtaining an endwise pressure upon the timber to be bent, and Fig. 3, represents a piece of timber bent into the form required for the rail of a carriage seat.

In Fig. (l) (A, A', A) are forming beds around which the timber is to be bent. (B) is a firm body piece to which the beds are attached. (C, C) are projections for holding the keys (D, D). (E, E) are clamp hooks attached to the forming'beds (A, A). i

(F) is a piece of timber bent according to the form shown in Fig'. 1.

(Gr) is a metallic strap connected to the frame by the pin (H) having at its eX- tremity the screw (I) by which an endwise pressure is made upon the timber before bending. The strap laying upon the rounding or outer surface of the timber at the curve serves to bind the piece (F) firmly onto the form; also to prevent, by the endwise pressure of the screw, the grain of the timber from breaking upon the outer surface, and shortens the grain upon the inner surface. I-Ieretofore the metallic strap has been used in the process of bending timber where only a single curve is obtained. The nature of' my invention consists in a device whereby the metallic strap after passing one curve upon a piece of timber may be conf nected with a strap placed upon another side of the same piece for the purpose of bending it in another direction, and thereby 'continuing the endwise pressure through the various curves to which the piece may be subjected. This connection between the straps upon the different sides of the timber may be made by an angular set-off as shown at (O), the straps being riveted or otherwise firmly fastened to the wings of the device. I do not desire to limit myself to this precise form of a seto, but generally to any form of connection by which the strap and pressure may be made continuous over the curves in different directions upon the same stick.

I do not claim to have invented the application of endwise pressure in the process of bending timber, as it is in general use.

"What I claim as my invention, and desire to secure by Letters Patent, is,

The method substantially as described of connecting metallic straps for bending timber when the parts are so arranged as to operate in connection with the forming frames in the manner and for the purpose set forth.

JOHN L. FIELD.

Witnesses:

R. F. STEVENS, R. W. JONES. 

